GeoJS vs SLF
Same instrument, two spec sheets — measured, not claimed.
GeoJS vs SLF: common questions
Which is more reliable, GeoJS or SLF?
On our scheduled checks, SLF leads on measured uptime — GeoJS at 98.9% versus SLF at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, GeoJS or SLF?
GeoJS has the lower median latency in our checks — GeoJS responds in 62 ms versus SLF at 145 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do GeoJS and SLF need an API key?
Neither needs a paid key — GeoJS is callable with no signup, and SLF is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call GeoJS and SLF from the browser?
Yes — both GeoJS and SLF send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are GeoJS and SLF free for commercial use?
GeoJS has unclear commercial terms, and SLF has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.